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Clitocybe compressipes

[Basidiomycetes > Agaricales > Tricholomataceae > Clitocybe...]

by Michael Kuo

This little litter decomposer looks like many other clitocyboid and omphalinoid mushrooms, but can be separated on the basis of its "hygrophanous" cap, which quickly fades from moist and brownish to dry and whitish; its mealy odor; its often compressed stem (see the illustration), for which the species is named; and microscopic features, including ellipsoid, amyloid spores.

Description:

Ecology: Saprobic; growing alone, scattered, gregariously, or in small clusters; found in grassy areas and disturbed-ground locations, or in open conifer woods; summer and fall; possibly widespread east of the Great Plains.

Cap: 1-4.5 cm; convex with an inrolled margin, becoming flat or centrally depressed, with an even margin; at first with a finely granular, whitish dusting, but soon bald; moist when fresh; brownish, fading markedly to buff as it dries out; the margin not lined.

Gills: Beginning to run down the stem; close or nearly distant; whitish.

Stem: 1-3 cm long; up to 3 mm thick; more or less equal, but often compressed with a central vertical groove (and then up to 1 cm wide); moist when fresh; colored like the cap; basal mycelium whitish.

Flesh: Insubstantial; watery buff.

Odor and Taste: Usually mealy, but sometimes not distinctive.

Chemical Reactions: KOH on cap surface negative.

Spore Print: White.

Microscopic Details: Spores 5-8 x 3-5 µ; ellipsoid; smooth; amyloid. Pileipellis a slightly gelatinized cutis of elements 2.5-4 µ wide, with intracellular pigment. Clamp connections present.

REFERENCES: (Peck, 1880) Saccardo, 1887. (Kauffman, 1918; Bigelow, 1982.) Herb. Kuo 10010502.

Clitocybe compressipes was named by Peck (1880) on the basis of collections from Albany, New York--but the name Pseudoomphalina compressipes (a taxonomic synonym of Clitocybe compressipes) is sometimes applied by contemporary European mycologists to a non-hygrophanous European species that is more brown and differs microscopically (it features finely encrusted, rather than intracellular, pigments in its pileipellis).

 

Clitocybe compressipes

Clitocybe compressipes

Clitocybe compressipes



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Kuo, M. (2010, May). Clitocybe compressipes. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/clitocybe_compressipes.html